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MSVC: Do not add /GR to CMAKE_CXX_FLAGS by default

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The `/GR` flag has been on by default since MSVC cl 14.0 from VS 2005.
Remove it from the default flags to make it easier for projects to pass
`/GR-` themselves to turn it off.

Projects may be using string processing to replace `/GR` with another
flag, so we cannot simply drop it.  Add a policy to drop it in a
compatible way.

Fixes: #21428
This commit is contained in:
Brad King
2020-11-13 11:15:57 -05:00
parent 6114c8e994
commit c00a6d3967
12 changed files with 88 additions and 1 deletions
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7
Help/release/dev/msvc-no-GR.rst Normal file
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msvc-no-GR
----------
* With MSVC-like compilers the value of
:variable:`CMAKE_CXX_FLAGS <CMAKE_<LANG>_FLAGS>` no longer contains
the ``/GR`` flag for runtime type information by default.
See policy :policy:`CMP0117`.